Musannaf Ibn Abi Shaybah

Hazrat Abu Musa narrates that Hazrat Ali led us in prayer during the Battle of Jamal and also said that the Holy Prophet (peace and blessings be upon him) used to offer prayer in this manner. Then either we forgot it or we deliberately abandoned it. He led the prayer such that at every bowing and rising, and during standing and sitting, he said "Allahu Akbar." And he turned his head to the right and to the left while saying the salam.